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Stock-Based Compensation; Changes in Equity (Details 2)
6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Options Outstanding (in shares) | shares 143,094
Weighted Average, Options Outstanding (in dollars per share) | $ / shares $ 5.22
Remaining Life, Options Outstanding 1 year 6 months
Intrinsic Value, Options Outstanding (in dollars) | $ $ 65,518
Shares, Options Vested (in shares) | shares 113,238
Weighted Average, Options Vested (in dollars per share) | $ / shares $ 5.21
Remaining Life, Option Vested 1 year
Intrinsic Value, Options Vested (in dollars) | $ $ 53,748
Stock Options By Grant Date Dec 2005 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Options Outstanding (in shares) | shares 0
Weighted Average, Options Outstanding (in dollars per share) | $ / shares $ 0
Remaining Life, Options Outstanding 0 years
Intrinsic Value, Options Outstanding (in dollars) | $ $ 0
Shares, Options Vested (in shares) | shares 0
Weighted Average, Options Vested (in dollars per share) | $ / shares $ 0
Remaining Life, Option Vested 0 years
Intrinsic Value, Options Vested (in dollars) | $ $ 0
Stock Options By Grant Date Dec 2010 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Options Outstanding (in shares) | shares 0
Weighted Average, Options Outstanding (in dollars per share) | $ / shares $ 0
Remaining Life, Options Outstanding 0 years
Intrinsic Value, Options Outstanding (in dollars) | $ $ 0
Shares, Options Vested (in shares) | shares 0
Weighted Average, Options Vested (in dollars per share) | $ / shares $ 0
Remaining Life, Option Vested 0 years
Intrinsic Value, Options Vested (in dollars) | $ $ 0
Stock Options By Grant Date Jan 2011 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Options Outstanding (in shares) | shares 0
Weighted Average, Options Outstanding (in dollars per share) | $ / shares $ 0
Remaining Life, Options Outstanding 0 years
Intrinsic Value, Options Outstanding (in dollars) | $ $ 0
Shares, Options Vested (in shares) | shares 0
Weighted Average, Options Vested (in dollars per share) | $ / shares $ 0
Remaining Life, Option Vested 0 years
Intrinsic Value, Options Vested (in dollars) | $ $ 0
Stock Options By Grant Date Nov 2012 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Options Outstanding (in shares) | shares 90,000
Weighted Average, Options Outstanding (in dollars per share) | $ / shares $ 5.17
Remaining Life, Options Outstanding 4 months 24 days
Intrinsic Value, Options Outstanding (in dollars) | $ $ 45,900
Shares, Options Vested (in shares) | shares 90,000
Weighted Average, Options Vested (in dollars per share) | $ / shares $ 5.17
Remaining Life, Option Vested 4 months 24 days
Intrinsic Value, Options Vested (in dollars) | $ $ 45,900
Stock Options By Grant Date Nov 2013 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Options Outstanding (in shares) | shares 5,000
Weighted Average, Options Outstanding (in dollars per share) | $ / shares $ 5.75
Remaining Life, Options Outstanding 1 year 4 months 24 days
Intrinsic Value, Options Outstanding (in dollars) | $ $ 0
Shares, Options Vested (in shares) | shares 4,000
Weighted Average, Options Vested (in dollars per share) | $ / shares $ 5.75
Remaining Life, Option Vested 1 year 4 months 24 days
Intrinsic Value, Options Vested (in dollars) | $ $ 0
Stock Options By Grant Date Dec 2015 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares, Options Outstanding (in shares) | shares 48,094
Weighted Average, Options Outstanding (in dollars per share) | $ / shares $ 5.27
Remaining Life, Options Outstanding 3 years 6 months
Intrinsic Value, Options Outstanding (in dollars) | $ $ 19,618
Shares, Options Vested (in shares) | shares 19,238
Weighted Average, Options Vested (in dollars per share) | $ / shares $ 5.27
Remaining Life, Option Vested 3 years 6 months
Intrinsic Value, Options Vested (in dollars) | $ $ 7,848